build: 🎨 Add release badge to README

README.md

@@ -1,5 +1,7 @@
 # UCSC functionality for WordPress sites
 
+[![Build and release](https://github.com/ucsc/ucsc-custom-functionality/actions/workflows/release.yml/badge.svg)](https://github.com/ucsc/ucsc-custom-functionality/actions/workflows/release.yml)
+
 This is WordPress plugin contains custom functionality for UCSC websites. The concept is to keep features of a site that are theme independent, such as custom post-types, taxonomies, and roles separate from the [UCSC theme code](https://github.com/ucsc/theme-ucsc). This will ensure that future theme changes do not affect a site's functionality.
 
 ## Features